5.3.0 does not need to be a typo. The very first version was 5.2.0. The jailbreak for it (here) by NiLuJe was destroyed with 5.3.0 update, unless you installed the jailbreak bridge. Until ixtab made the new jailbreak, there was a time where you could not jailbreak 5.3.0 unless you went 5.2.0, jailbreak and jailbreak bridge, then let it update.

Sorry, My Bad, I was getting the update numbers confused.
(And I wrote up the firmware <-> model list.)

But I wasn't 100% wrong - if the device updates to 5.3.3 it will not be possible to jailbreak it without reloading 5.3.1 (or earlier).